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Linux/drivers/pci/hotplug/pciehp_core.c

  1 /*
  2  * PCI Express Hot Plug Controller Driver
  3  *
  4  * Copyright (C) 1995,2001 Compaq Computer Corporation
  5  * Copyright (C) 2001 Greg Kroah-Hartman (greg@kroah.com)
  6  * Copyright (C) 2001 IBM Corp.
  7  * Copyright (C) 2003-2004 Intel Corporation
  8  *
  9  * All rights reserved.
 10  *
 11  * This program is free software; you can redistribute it and/or modify
 12  * it under the terms of the GNU General Public License as published by
 13  * the Free Software Foundation; either version 2 of the License, or (at
 14  * your option) any later version.
 15  *
 16  * This program is distributed in the hope that it will be useful, but
 17  * WITHOUT ANY WARRANTY; without even the implied warranty of
 18  * MERCHANTABILITY OR FITNESS FOR A PARTICULAR PURPOSE, GOOD TITLE or
 19  * NON INFRINGEMENT.  See the GNU General Public License for more
 20  * details.
 21  *
 22  * You should have received a copy of the GNU General Public License
 23  * along with this program; if not, write to the Free Software
 24  * Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
 25  *
 26  * Send feedback to <greg@kroah.com>, <kristen.c.accardi@intel.com>
 27  *
 28  */
 29 
 30 #include <linux/module.h>
 31 #include <linux/moduleparam.h>
 32 #include <linux/kernel.h>
 33 #include <linux/slab.h>
 34 #include <linux/types.h>
 35 #include <linux/pci.h>
 36 #include "pciehp.h"
 37 #include <linux/interrupt.h>
 38 #include <linux/time.h>
 39 
 40 /* Global variables */
 41 bool pciehp_debug;
 42 bool pciehp_poll_mode;
 43 int pciehp_poll_time;
 44 static bool pciehp_force;
 45 
 46 #define DRIVER_VERSION  "0.4"
 47 #define DRIVER_AUTHOR   "Dan Zink <dan.zink@compaq.com>, Greg Kroah-Hartman <greg@kroah.com>, Dely Sy <dely.l.sy@intel.com>"
 48 #define DRIVER_DESC     "PCI Express Hot Plug Controller Driver"
 49 
 50 MODULE_AUTHOR(DRIVER_AUTHOR);
 51 MODULE_DESCRIPTION(DRIVER_DESC);
 52 MODULE_LICENSE("GPL");
 53 
 54 module_param(pciehp_debug, bool, 0644);
 55 module_param(pciehp_poll_mode, bool, 0644);
 56 module_param(pciehp_poll_time, int, 0644);
 57 module_param(pciehp_force, bool, 0644);
 58 MODULE_PARM_DESC(pciehp_debug, "Debugging mode enabled or not");
 59 MODULE_PARM_DESC(pciehp_poll_mode, "Using polling mechanism for hot-plug events or not");
 60 MODULE_PARM_DESC(pciehp_poll_time, "Polling mechanism frequency, in seconds");
 61 MODULE_PARM_DESC(pciehp_force, "Force pciehp, even if OSHP is missing");
 62 
 63 #define PCIE_MODULE_NAME "pciehp"
 64 
 65 static int set_attention_status (struct hotplug_slot *slot, u8 value);
 66 static int enable_slot          (struct hotplug_slot *slot);
 67 static int disable_slot         (struct hotplug_slot *slot);
 68 static int get_power_status     (struct hotplug_slot *slot, u8 *value);
 69 static int get_attention_status (struct hotplug_slot *slot, u8 *value);
 70 static int get_latch_status     (struct hotplug_slot *slot, u8 *value);
 71 static int get_adapter_status   (struct hotplug_slot *slot, u8 *value);
 72 static int reset_slot           (struct hotplug_slot *slot, int probe);
 73 
 74 /**
 75  * release_slot - free up the memory used by a slot
 76  * @hotplug_slot: slot to free
 77  */
 78 static void release_slot(struct hotplug_slot *hotplug_slot)
 79 {
 80         kfree(hotplug_slot->ops);
 81         kfree(hotplug_slot->info);
 82         kfree(hotplug_slot);
 83 }
 84 
 85 static int init_slot(struct controller *ctrl)
 86 {
 87         struct slot *slot = ctrl->slot;
 88         struct hotplug_slot *hotplug = NULL;
 89         struct hotplug_slot_info *info = NULL;
 90         struct hotplug_slot_ops *ops = NULL;
 91         char name[SLOT_NAME_SIZE];
 92         int retval = -ENOMEM;
 93 
 94         hotplug = kzalloc(sizeof(*hotplug), GFP_KERNEL);
 95         if (!hotplug)
 96                 goto out;
 97 
 98         info = kzalloc(sizeof(*info), GFP_KERNEL);
 99         if (!info)
100                 goto out;
101 
102         /* Setup hotplug slot ops */
103         ops = kzalloc(sizeof(*ops), GFP_KERNEL);
104         if (!ops)
105                 goto out;
106 
107         ops->enable_slot = enable_slot;
108         ops->disable_slot = disable_slot;
109         ops->get_power_status = get_power_status;
110         ops->get_adapter_status = get_adapter_status;
111         ops->reset_slot = reset_slot;
112         if (MRL_SENS(ctrl))
113                 ops->get_latch_status = get_latch_status;
114         if (ATTN_LED(ctrl)) {
115                 ops->get_attention_status = get_attention_status;
116                 ops->set_attention_status = set_attention_status;
117         }
118 
119         /* register this slot with the hotplug pci core */
120         hotplug->info = info;
121         hotplug->private = slot;
122         hotplug->release = &release_slot;
123         hotplug->ops = ops;
124         slot->hotplug_slot = hotplug;
125         snprintf(name, SLOT_NAME_SIZE, "%u", PSN(ctrl));
126 
127         retval = pci_hp_register(hotplug,
128                                  ctrl->pcie->port->subordinate, 0, name);
129         if (retval)
130                 ctrl_err(ctrl, "pci_hp_register failed: error %d\n", retval);
131 out:
132         if (retval) {
133                 kfree(ops);
134                 kfree(info);
135                 kfree(hotplug);
136         }
137         return retval;
138 }
139 
140 static void cleanup_slot(struct controller *ctrl)
141 {
142         pci_hp_deregister(ctrl->slot->hotplug_slot);
143 }
144 
145 /*
146  * set_attention_status - Turns the Amber LED for a slot on, off or blink
147  */
148 static int set_attention_status(struct hotplug_slot *hotplug_slot, u8 status)
149 {
150         struct slot *slot = hotplug_slot->private;
151 
152         pciehp_set_attention_status(slot, status);
153         return 0;
154 }
155 
156 
157 static int enable_slot(struct hotplug_slot *hotplug_slot)
158 {
159         struct slot *slot = hotplug_slot->private;
160 
161         return pciehp_sysfs_enable_slot(slot);
162 }
163 
164 
165 static int disable_slot(struct hotplug_slot *hotplug_slot)
166 {
167         struct slot *slot = hotplug_slot->private;
168 
169         return pciehp_sysfs_disable_slot(slot);
170 }
171 
172 static int get_power_status(struct hotplug_slot *hotplug_slot, u8 *value)
173 {
174         struct slot *slot = hotplug_slot->private;
175 
176         pciehp_get_power_status(slot, value);
177         return 0;
178 }
179 
180 static int get_attention_status(struct hotplug_slot *hotplug_slot, u8 *value)
181 {
182         struct slot *slot = hotplug_slot->private;
183 
184         pciehp_get_attention_status(slot, value);
185         return 0;
186 }
187 
188 static int get_latch_status(struct hotplug_slot *hotplug_slot, u8 *value)
189 {
190         struct slot *slot = hotplug_slot->private;
191 
192         pciehp_get_latch_status(slot, value);
193         return 0;
194 }
195 
196 static int get_adapter_status(struct hotplug_slot *hotplug_slot, u8 *value)
197 {
198         struct slot *slot = hotplug_slot->private;
199 
200         pciehp_get_adapter_status(slot, value);
201         return 0;
202 }
203 
204 static int reset_slot(struct hotplug_slot *hotplug_slot, int probe)
205 {
206         struct slot *slot = hotplug_slot->private;
207 
208         return pciehp_reset_slot(slot, probe);
209 }
210 
211 static int pciehp_probe(struct pcie_device *dev)
212 {
213         int rc;
214         struct controller *ctrl;
215         struct slot *slot;
216         u8 occupied, poweron;
217 
218         /* If this is not a "hotplug" service, we have no business here. */
219         if (dev->service != PCIE_PORT_SERVICE_HP)
220                 return -ENODEV;
221 
222         if (!dev->port->subordinate) {
223                 /* Can happen if we run out of bus numbers during probe */
224                 dev_err(&dev->device,
225                         "Hotplug bridge without secondary bus, ignoring\n");
226                 return -ENODEV;
227         }
228 
229         ctrl = pcie_init(dev);
230         if (!ctrl) {
231                 dev_err(&dev->device, "Controller initialization failed\n");
232                 return -ENODEV;
233         }
234         set_service_data(dev, ctrl);
235 
236         /* Setup the slot information structures */
237         rc = init_slot(ctrl);
238         if (rc) {
239                 if (rc == -EBUSY)
240                         ctrl_warn(ctrl, "Slot already registered by another hotplug driver\n");
241                 else
242                         ctrl_err(ctrl, "Slot initialization failed (%d)\n", rc);
243                 goto err_out_release_ctlr;
244         }
245 
246         /* Enable events after we have setup the data structures */
247         rc = pcie_init_notification(ctrl);
248         if (rc) {
249                 ctrl_err(ctrl, "Notification initialization failed (%d)\n", rc);
250                 goto err_out_free_ctrl_slot;
251         }
252 
253         /* Check if slot is occupied */
254         slot = ctrl->slot;
255         pciehp_get_adapter_status(slot, &occupied);
256         pciehp_get_power_status(slot, &poweron);
257         if (occupied && pciehp_force) {
258                 mutex_lock(&slot->hotplug_lock);
259                 pciehp_enable_slot(slot);
260                 mutex_unlock(&slot->hotplug_lock);
261         }
262         /* If empty slot's power status is on, turn power off */
263         if (!occupied && poweron && POWER_CTRL(ctrl))
264                 pciehp_power_off_slot(slot);
265 
266         return 0;
267 
268 err_out_free_ctrl_slot:
269         cleanup_slot(ctrl);
270 err_out_release_ctlr:
271         pciehp_release_ctrl(ctrl);
272         return -ENODEV;
273 }
274 
275 static void pciehp_remove(struct pcie_device *dev)
276 {
277         struct controller *ctrl = get_service_data(dev);
278 
279         cleanup_slot(ctrl);
280         pciehp_release_ctrl(ctrl);
281 }
282 
283 #ifdef CONFIG_PM
284 static int pciehp_suspend(struct pcie_device *dev)
285 {
286         return 0;
287 }
288 
289 static int pciehp_resume(struct pcie_device *dev)
290 {
291         struct controller *ctrl;
292         struct slot *slot;
293         u8 status;
294 
295         ctrl = get_service_data(dev);
296 
297         /* reinitialize the chipset's event detection logic */
298         pcie_enable_notification(ctrl);
299 
300         slot = ctrl->slot;
301 
302         /* Check if slot is occupied */
303         pciehp_get_adapter_status(slot, &status);
304         mutex_lock(&slot->hotplug_lock);
305         if (status)
306                 pciehp_enable_slot(slot);
307         else
308                 pciehp_disable_slot(slot);
309         mutex_unlock(&slot->hotplug_lock);
310         return 0;
311 }
312 #endif /* PM */
313 
314 static struct pcie_port_service_driver hpdriver_portdrv = {
315         .name           = PCIE_MODULE_NAME,
316         .port_type      = PCIE_ANY_PORT,
317         .service        = PCIE_PORT_SERVICE_HP,
318 
319         .probe          = pciehp_probe,
320         .remove         = pciehp_remove,
321 
322 #ifdef  CONFIG_PM
323         .suspend        = pciehp_suspend,
324         .resume         = pciehp_resume,
325 #endif  /* PM */
326 };
327 
328 static int __init pcied_init(void)
329 {
330         int retval = 0;
331 
332         retval = pcie_port_service_register(&hpdriver_portdrv);
333         dbg("pcie_port_service_register = %d\n", retval);
334         info(DRIVER_DESC " version: " DRIVER_VERSION "\n");
335         if (retval)
336                 dbg("Failure to register service\n");
337 
338         return retval;
339 }
340 
341 static void __exit pcied_cleanup(void)
342 {
343         dbg("unload_pciehpd()\n");
344         pcie_port_service_unregister(&hpdriver_portdrv);
345         info(DRIVER_DESC " version: " DRIVER_VERSION " unloaded\n");
346 }
347 
348 module_init(pcied_init);
349 module_exit(pcied_cleanup);
350 

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